4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai <tiwai@xxxxxxx> commit f9d94b57e30fd1575b4935045b32d738668aa74b upstream. As recently Smatch suggested, a couple of places in ASIHPI driver may expand the array directly from the user-space value with speculation: sound/pci/asihpi/hpimsginit.c:70 hpi_init_response() warn: potential spectre issue 'res_size' (local cap) sound/pci/asihpi/hpioctl.c:189 asihpi_hpi_ioctl() warn: potential spectre issue 'adapters' This patch puts array_index_nospec() for hardening against them. BugLink: https://marc.info/?l=linux-kernel&m=152411496503418&w=2 Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- sound/pci/asihpi/hpimsginit.c | 13 +++++++++---- sound/pci/asihpi/hpioctl.c | 4 +++- 2 files changed, 12 insertions(+), 5 deletions(-) --- a/sound/pci/asihpi/hpimsginit.c +++ b/sound/pci/asihpi/hpimsginit.c @@ -23,6 +23,7 @@ #include "hpi_internal.h" #include "hpimsginit.h" +#include <linux/nospec.h> /* The actual message size for each object type */ static u16 msg_size[HPI_OBJ_MAXINDEX + 1] = HPI_MESSAGE_SIZE_BY_OBJECT; @@ -39,10 +40,12 @@ static void hpi_init_message(struct hpi_ { u16 size; - if ((object > 0) && (object <= HPI_OBJ_MAXINDEX)) + if ((object > 0) && (object <= HPI_OBJ_MAXINDEX)) { + object = array_index_nospec(object, HPI_OBJ_MAXINDEX + 1); size = msg_size[object]; - else + } else { size = sizeof(*phm); + } memset(phm, 0, size); phm->size = size; @@ -66,10 +69,12 @@ void hpi_init_response(struct hpi_respon { u16 size; - if ((object > 0) && (object <= HPI_OBJ_MAXINDEX)) + if ((object > 0) && (object <= HPI_OBJ_MAXINDEX)) { + object = array_index_nospec(object, HPI_OBJ_MAXINDEX + 1); size = res_size[object]; - else + } else { size = sizeof(*phr); + } memset(phr, 0, sizeof(*phr)); phr->size = size; --- a/sound/pci/asihpi/hpioctl.c +++ b/sound/pci/asihpi/hpioctl.c @@ -33,6 +33,7 @@ #include <linux/stringify.h> #include <linux/module.h> #include <linux/vmalloc.h> +#include <linux/nospec.h> #ifdef MODULE_FIRMWARE MODULE_FIRMWARE("asihpi/dsp5000.bin"); @@ -182,7 +183,8 @@ long asihpi_hpi_ioctl(struct file *file, struct hpi_adapter *pa = NULL; if (hm->h.adapter_index < ARRAY_SIZE(adapters)) - pa = &adapters[hm->h.adapter_index]; + pa = &adapters[array_index_nospec(hm->h.adapter_index, + ARRAY_SIZE(adapters))]; if (!pa || !pa->adapter || !pa->adapter->type) { hpi_init_response(&hr->r0, hm->h.object,
